Adjustment for spring-scales



I (No Model.)

L. LANGDON,

ADJUSTMENT FOR SPRING SCALES.

No. 360,309 Patented Mar. 29. 1887.

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UNITED STATES PATENT OFFICE.

LEVI LANGDON, OF STOCKTON, CALIFORNIA.-

ADJUSTMENT FOR SPRING-SCALES.

SPECIFICATION forming part of Letters Patent No. 360,309, dated March 29, 1887.

Application filed September 16, 1886. Serial No. 213,684. (No model.)

To all whom it may concern.-

Be it known that I, LEVI LANGDON, a citizen of the United States, residing at Stockton, in the county of San Joaquin and State of California, have invented a new and useful Improvement in Spring- Balance Scales, of which the following is a specification.

My invention relates to an improvement in springloalances; and it consists in the pecu' liar construction and combination of devices, that will be more fully set forth hereinafter, and particularly pointed out in the claims.

In the drawings, Figure 1 is a front elevation of a spring-balance embodying my improvements. Fig. 2 is a side elevation of the same. Fig. 3 is a vertical sectional view. Fig. t is a horizontal section.

A represents the case, which is made of cast metal, and is provided with an open side,

1 on which is secured a plate, B, that is provided at its lower end with a slot, 0, and with a graduated scale, D, alongside the said slot, in the usual manner. Through the upper end of the case A extends a rod, E, which is provided with a head at its upper end, and to'which is swiveled an eye or ring, F, by means of which the spring-balance may be suspended from a nail or peg. Below the top of the case A, and on opposite sides of the rod E, are flanges or supports G. An eyebolt, H, has its eye supported upon the said flanges, and the outer threaded end of the said bolt passes through an opening in the rear side of the case, and is provided with a clampingnut, I. The rod E extends through the eye of the eyebolt, and to the lower end of the said rod is attached a coiled extensile spring, K. To the lower end of the said spring is attached a link, L, which extends through the lower end of the case A. From the outer side of the link, at the upper end thereof, projects a stud, M, to which is attached a pointer, N, that normally extends over the cipher at the upper end of the graduated scale. To the lower end of the link is attached the usual hook, I, by means of which the article to be weighed may be suspended from the balance. 'When the weight is applied to the hook, the spring is extended in the case and the link is lowered therefrom, and the hand or pointer moves downwardly on the graduated scale and indicates the weight in pounds or fractional portions thereof on the scale. 7

A disadvantage has been heretofore experienced in using spring-balances from the fact that the springs after being used for some time become slightly extended, and thus when there is no weight on the balance the hand, instead of pointing as it should to the cipher at the upper end of the graduated scale, re mains stationary at some point below the said cipher, and thus renders the spring-balance inaccurate.

My improvement consists in providing a clampingbolt for the rod to which the spring is attached, whereby the said rod may be V61 tically adjusted in the case and secured at any requisite position in order to cause the hand to normally point to the cipher on the scale, and thus when the spring becomes weakened by use and extended it may be slightly drawn upwardly in the case, so as to preserve the accuracy of the balance.

Having thus described my invention, I claim- 1. In a spring balance, the combination, with the case having the flanges or supports G, of the spring, the vertically-movable rod E, to which the spring is attached, the eyebolt bearing on the flanges or supports and embracing the adjustable rod, and the clamping-nut on the threaded end of the eyebolt, for the purpose set forth, substantially as described.

2. In a spring-balance, the case, in combination with the spring K, connecting with the pointer, the rod E, to which the spring is attached, and the transverse clamping-bolt to hold the rod E in any desired vertical adjustment, as set forth.

3. In a spring-balance, the case, in combination with the spring K, connecting with the pointer of the scale, the rod E, to which the spring is attached, said rod passing outward through the case and connecting with the handle or ring F, by means of which the scale is suspended, the rod E being capable of vertical movement when not held, and clamping means to hold the rod E from movement, which clamping means are operated from the exterior, so that the necessaryadjustment can be In testimony that I claim the foregoing as effected without taking the case apart, as set my own I have hereto affixed my signature in forth. presence of two witnesses.

4. In a spring-balance, the case, in conibi- 5 nation with the spring K, connecting with the LEVI LANGDON.

VPOiHtGI, the rod E, to which the spring is attached, the eyebolt embracing the rod, which Witnesses: bolt passes out through the case, and a nut 011 Y L. M. CUTTING, the outer end of the bolt to hold said bolt F. M. KENNEDY. 10 from movement, as set forth. 

